Celia Casey Cooking School Did you know that blueberries, those dusty blue-purple orbs with a flared crown on the end, not only taste great, but carry a surprise bonus inside as well? They may be small, but their health impact looms large. Rich in anthocyanins, compounds that provide antioxidant activity that can help relax smooth muscle and dilate arteries to improve blood flow, blueberries can help lower blood pressure and LDL cholesterol, decreasing the risk of having a heart attack.